JPS587739Y2 - TV channel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel display device for a television receiver, and more particularly to a channel display device for projecting channel numbers on a picture tube screen for an appropriate period of time after channel switching.

In conventional television receivers, channel numbers are generally displayed by rotating a channel display board in conjunction with the rotation of channel heirs.

However, in conventional channel display devices, due to their structure, the individual channel numbers cannot be made very large, and even if they could be made large, there was a risk that the numbers would become unsightly.

Moreover, recently there are television receivers on the market that allow channel switching by remote control, and in particular, with such television receivers, channels can be switched from a location quite far away from the receiver. , whereas in this case the channel numbers were hard to see.

In view of the above, the present invention provides a channel display device in a television receiver that projects the received channel number on the picture tube screen for a short time every time the channel is changed. Another object of the present invention is to provide a channel display device capable of displaying channel numbers that have a particularly three-dimensional effect and are easy to read in such a television receiver.

The present invention will be explained below according to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, where 1 is an antenna, 2 is a tuner circuit, 3 is a channel selection device, 4 is an intermediate frequency amplification circuit, and 5 is a video detection circuit. ,
6 is a video amplifier circuit, 7 is a picture tube, 8 is an audio intermediate frequency amplifier circuit, 9 is an audio detection circuit, 10 is an audio amplifier circuit, 11 is a speaker, 12 is a synchronization separation circuit, 13 is a vertical oscillation circuit,
14 is a vertical deflection circuit, 15 is a horizontal oscillation circuit, and 16 is a horizontal deflection circuit, and these constitute a normal television receiver circuit.

The present invention specifically adds a signal synthesis circuit 17, a display time setting circuit 18, a selection circuit 19, a channel character signal generation circuit 20, and a character shading signal generation circuit 21 to such a television receiver circuit. When the reception channel is switched in the station equipment 3, the channel character signal generation circuit 20 generates character signals (including numeric signals) corresponding to the reception channel at the time based on the signal from the selection circuit 19; Shadow signal generation circuit 2
1, a shadow signal is generated based on the character signal, and these character signals and shadow signals are superimposed on the video signal from the video amplification circuit 6 for a predetermined time after channel switching in the signal synthesis circuit 17, and are supplied to the picture tube 7. By this, the picture tube 7
The system displays the characters (including numbers) of the receiving channel for a short time after the channel is switched.

FIG. 2 shows an example of what is displayed on the picture tube screen by the channel display device of the present invention (when receiving 6 channels).

Here, the number 6 representing the receiving channel appears in white, and a black shading appears to the right of this number.

To explain each of the above-mentioned circuits according to the present invention in detail individually, when the channel is switched, the display time setting circuit 18 adds channel characters to the video signal for a short period of time (for example, about 1 second) from the moment the channel is switched. This is a circuit for operating the signal synthesis circuit 17 so that the signal and the character shading signal are superimposed and supplied to the picture tube 7, and specifically, it can be constructed from a monostable multivibrator circuit.

In addition, the channel character signal generation circuit 20 generates a 1, 2°, 3 .
The selection circuit 19 generates various character signals corresponding to the numbers and other characters such as U or V as necessary.
A specific channel character signal is derived based on a channel selection signal supplied by the channel selection signal.

Let's take the case of FIG. 2, that is, the case of receiving 6 channels, as an example. In the channel character signal generation circuit 20, Hl,
In each horizontal scanning period of Hm and Hn,
), c are created.

Further, the character shading signal generation circuit 21 is a circuit that creates a shading signal based on the channel character signal obtained from the channel character signal generation circuit 20. For example, the character signal generation circuit 20 generates a character signal as shown in FIG. 3C. When obtained, this character signal is once differentiated as shown in FIG. 3d, and only the negative pulse component is detected and amplified to obtain a character shadow signal as shown in FIG. 3e.

By superimposing the thus obtained channel character signal and character shading signal on the television video signal and supplying the same to the picture tube 7, easy-to-read channel characters with a three-dimensional effect can be projected on the picture tube screen.

In the above-mentioned embodiment, the target is mainly a black and white television receiver, and an example was shown in which the channel characters are displayed in white and the shaded part of the characters is displayed in black, but in the case of a color television receiver, the channel By separately extracting the character signal and the character shading signal and supplying them to the picture tube, the channel characters and the shading area can be displayed in different colors.

According to the television receiver equipped with the channel display device of the present invention, for a certain period of time after channel switching, the channel letters corresponding to the receiving channel are displayed all at once on the picture tube screen. Since shading is added, the reception channel can be seen at a glance even from a distance.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a television receiver equipped with a channel display device according to the present invention, Fig. 2 is an example of channel letters appearing on the picture tube screen of the television receiver, and Fig. 3 is a block diagram of a television receiver equipped with a channel display device according to the present invention. FIG. 3 is a signal waveform diagram for explaining the operation of the channel display device according to the present invention. 1 is an antenna, 2 is a tuner circuit, 3 is a channel selection device, 4 is an intermediate frequency amplification circuit, 5 is a video detection circuit, 6 is a video amplification circuit, 7 is a picture tube, 8 is an audio intermediate frequency amplification circuit, 9
10 is an audio detection circuit, 10 is an audio amplification circuit, 11 is a speaker, 12 is a synchronization separation circuit, 13 is a vertical oscillation circuit, 14 is a vertical deflection circuit, 15 is a horizontal oscillation circuit, 16 is a horizontal deflection circuit,
17 is a signal synthesis circuit, 18 is a display time setting circuit, 19 is a selection circuit, 20 is a channel character signal generation circuit, and 21 is a character shadow signal generation circuit.

Claims (1)

[Scope of utility model registration request] In a television receiver, a display time setting circuit for creating a display command pulse signal having a constant pulse time and synchronized with the switching of a reception channel in a channel selection device; a channel selection circuit that separates the channel selection signals into individual channel selection signals that can be identified by the selection circuit; and a channel selection circuit that generates a channel character signal corresponding to the received channel based on the channel selection signal from the selection circuit and the horizontal and vertical pulse signals in the television receiver. comprising a character signal generation circuit, and a character shading signal generation circuit that generates a character shading signal of opposite polarity to the channel character signal based on a differentiated signal obtained by differentiating the channel character signal obtained from the channel character signal generation circuit,
A channel display device characterized by displaying channel letters with shading on a picture tube screen for a certain period of time after channel switching.